Hello Ian Bell,
I think the program in which you open the SVG does not support the "vector-effect=non-scaling-stroke"-Property. Which Program do you use to display the SVG? For me it works correctly in current versions of Firefox and Google Chrome. My IE11 gives "fat lines" with vector-effect.
If that is your problem you could try to remove this property in the svg file directly for every element. In addition you have to remove the unit-appendix for the stroke-width.
Example:
<path d="M12.757 15.637 L12.757 12.217"
fill="none" vector-effect="non-scaling-stroke" stroke="#000000" stroke-width="0.200mm" fpd:engraving_ral_9005="1" />
becomes to:
<path d="M12.757 15.637 L12.757 12.217"
fill="none" stroke="#000000" stroke-width="0.200" fpd:engraving_ral_9005="1" />
Maybe Search&Replace of your favourite text editor turns out helpful.
Another option is of course to use a newer program with better SVG support.
This is also what older versions of FPD generated.
This should work fine in most cases. One case where this causes trouble is if you use X-Scaling in your engravings. Due to that we needed to use the vector-effect property and unfortunately some (older) programs do not support that correctly.
Is this helpful for you?
Sincerely,
--
Sven Gaul Schaeffer AG